PPC/s390: [ignition] Make SuspendGenerator return

Port 5cef3ddd

Original Commit Message:

    Instead of requiring the pattern that a SuspendGenerator must be
    followed by a Return, make SuspendGenerator return directly. This can,
    in the future, simplify some of the reasoning around generator suspends.

R=leszeks@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: Ic967164b40433ed64df5996560490b13d6159a94
Reviewed-on: https://chromium-review.googlesource.com/879223Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#50774}

src/builtins/ppc/builtins-ppc.cc

@@ -1039,12 +1039,15 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
            MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
   __ SmiUntag(kInterpreterBytecodeOffsetRegister);
 
-  // Check if we should return.
+  // Check if we should return by testing for one of the returning bytecodes.
   Label do_return;
   __ lbzx(r4, MemOperand(kInterpreterBytecodeArrayRegister,
                          kInterpreterBytecodeOffsetRegister));
-  __ cmpi(r4, Operand(static_cast<int>(interpreter::Bytecode::kReturn)));
+#define JUMP_IF_EQUAL(NAME)                                               \
+  __ cmpi(r4, Operand(static_cast<int>(interpreter::Bytecode::k##NAME))); \
   __ beq(&do_return);
+  RETURN_BYTECODE_LIST(JUMP_IF_EQUAL)
+#undef JUMP_IF_EQUAL
 
   // Advance to the next bytecode and dispatch.
   AdvanceBytecodeOffset(masm, kInterpreterBytecodeArrayRegister,

src/builtins/s390/builtins-s390.cc

@@ -1038,12 +1038,15 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
            MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
   __ SmiUntag(kInterpreterBytecodeOffsetRegister);
 
-  // Check if we should return.
+  // Check if we should return by testing for one of the returning bytecodes.
   Label do_return;
   __ LoadlB(r3, MemOperand(kInterpreterBytecodeArrayRegister,
                            kInterpreterBytecodeOffsetRegister));
-  __ CmpP(r3, Operand(static_cast<int>(interpreter::Bytecode::kReturn)));
+#define JUMP_IF_EQUAL(NAME)                                               \
+  __ CmpP(r3, Operand(static_cast<int>(interpreter::Bytecode::k##NAME))); \
   __ beq(&do_return);
+  RETURN_BYTECODE_LIST(JUMP_IF_EQUAL)
+#undef JUMP_IF_EQUAL
 
   // Advance to the next bytecode and dispatch.
   AdvanceBytecodeOffset(masm, kInterpreterBytecodeArrayRegister,